A California man is suing Microsoft, alledging that his Surface tablet did not provide the advertised amount of disk space. The 32G device has 16G of space for users, as the operating system uses the other 16G. The 64G Surface leaves 45G free for users. The case will turn on whether Microsoft has clearly explained to customers how much free space the Surface leaves for their use outside of the OS. How much disk space does your OS consume?

Everyone else advertises their devices 16, 32 64 GB devices, Microsoft advertised 32GB of storage space, which means that is what is available to use. Using the words "storage space" changes everything.